[pseudonyms] adopted by co-authors

2. An official pseudonym used by film directors who wish to disown a project was coined in 1968. Until its use was formally discontinued in 2000, it was the sole pseudonym used by members of the Directors Guild of America. What was it?

3. Frederic Dannay and James Yaffe used a collective pseudonym for their crime writing. In a successful series of novels that covered 42 years, this pseudonym served as both the author's name and that of the detective-hero. What was that name?

4. American mother-daughter writing team Patricia and Traci Lambrecht teamed up to write award winning novels, particularly Monkeewrench. Under which name do they write?

5. What was the pseudonym adopted by a German Research Project for a massive compiling of materials opposed to Einstein's special theory of relativity?